Process of making matched-pattern plates



J. R. WOOD PROCESS OF MAKING MATCHED PATTERN PLATES April\ 21, 1925.

Filed Sept. 19, 9

. iNVENTOR Ja/uz 1?. 1/0

ATTORNEY BY J M w.

Patented Apr. 21, 1925.

UNITED STATES PATENT OFFICE.

JOHN R. WOOD, OF IRVINGTON, NEW JERSEY, .ASSIGNOR TO NEW PROCESS MULTI-CASTINGS COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY.

PROCESS OF MAKING MARKED-PATTERN PLATES.

Application filed September 19, 1923. Serial No. 663,535.

T 0 all whom it may concern Be it known that I, JOHN R. VVooD, a citizenof the United States of America, residing at Irvington, in the county ofEssex and State of New Jersey, have invented certain new and usefulImprovements in Processes of Making Matched-Pattern Plates, of which thefollowing is a full, clear, and exact description- In the process ofmolding by the use of sand in flasks, one of the commonly practiced waysof obtaining the molds is by the use of matched plates, or two separateface plates, one for the drag, the other for the cope member of theflask. These plates it is very difficult to'produce in a form in whichthey exactly match so that they are expensive and when obtainable do notproduce perfect castm s.

The invention which forms the subject of my present application forLetters Patent resides in a novel and economical method of obtainingthese two matched plates from one and the same mold, and in order toconvey a clear understanding of how I accomplish this I may describe insomewhat general terms the process which I foll0w In carrying out theinvention I construct two flasks which are exact counter parts, eachcomposed of a drag and a cope member which are interchangeable, and forconvenience in illustration I shall hereinafter refer to these membersas the No. 1 and the No. 2 drags and the No. 1 and the No. 2

' copes.

The first step in the process is by the use of a follow board with apattern thereon and laid over the upper joint of an inverted drag flaskmember to form by ramming in any known way the No. 1 drag, in order toobtain in sand the impression of the pattern below the parting line. Thesand is then struck oif even with the joint and a bottom board attachedto the drag member which is then inverted.

lVith this drag, with the pattern therein, but with the follow boardremoved, No. 1 cope member is then associated and removed, after theparting lines have been gone over to see that they accord with thepattern. This cope member will give the impression of the pattern abovethe parting lines in the sand and it is then removed and set aside,

care being taken not to disturb or patch the mold as otherwise therewould not result a perfect match.

I then take No. 2 cope member and associate it with No. 1 drag memberand fill it with sand and ram it sufliciently. It is tlun removed anddressed, if need be, as this does not change any impression desired inthe drag member No. 1.

I then place the pattern in the sand of No. l cope member and associatewith it No. 2 drag member and ram the same dressing it, if so desired,and then separate the two members removing the pattern from the cope.There will thus be produced two drag members, No. 1 of which gives theexact impression of the pattern below the parting line, and two copemembers, No. 1 of which gives the exact impression of the pattern abovethe parting line.

I then lay over the sand of No. 1 drag a pattern frame and over theedges of the joint strips of exactly the same thickness as said patternframe. Between these strips and the edges of the frame there will remainempty spaces and these are then filled and packed with sandto the levelof the top of thestrips and the pattern frame then removed or liftedfrom the mold.

No. 2 cope is then associated with No. 1 drag with the interposed stripsand a complete mold will thus be formed which. when poured, will producea drag plate with an exact copy of all parts of the original patternbelow the parting line.

In the same way a pattern frame or plate is placed on the sand of N0. 1cope and strips of exactly the same thickness as said frame laid on theedges, the spaces between said strip and the frame packed and levelledoff, the frame lifted and the two flask members associated to form amold which, when poured, gives a cope plate wit-h an exact copy of allparts of the original pattern above the parting line.

In this way there are produced two separate matched plates both takenfrom one mold, eac h givinor the exact reproduction of the correspondingfaces of the pattern used. These plates may be used with anv kind offlask, but preferably with the two arts of a flask which, after beingrammed y or on apower molding machine, may be brought together as copeand drag and then stripped from the molded sand and used for makingother molds.

N0 practical way has ever been devised heretofore, so far as I am aware,for making these matched pattern parts or plates from one and the samemold, but it is inanifest from the above that the two plates which Iproduce are perfectly matched and may be used to produce perfectcastings in any of the ways now known to the molders art.

To illustrate so much of the above described process as I believe to benecessary in view of the present knowledge on the part of those skilledin the art, I have attached hereto a drawing in which Fig. 1 shows insection the two members of a flask with the pattern therein, and whichmay he considered as No. 1 cope and N o. 1 drag.

Fig. 2 is a similar view of what may be considered as No. 2 cope and No.1 drag as sociated with the edge strips between the two, and the spaceleft by the removal of the pattern frame. 0

Fig. 3 is a similar view under similar conditions of No. 2 drag and No.1 cope associated.

Fig. 4 is a plan View of a frame to be interposed between the twomembers and Fig. 5 is a sectional view of Fig. 2 showing the top of thesand mold condition for pouring.

The plates 1 are made of exactly the proper dimensions for the flask orflasks with which they are to be used and have ears 2 with perforationsto fit over pins in the sides or edges of the flask. The copes 3 anddrags 4 are in all respects similar to those now or heretofore in useand they are made up for use in any of the ways known in the art. InFigs. 2 and 3 the side or edge strips are designated by 5; the sandfillings between said strips and the edges of the pattern frames 6 areindicated by 7 and thepattern by 8.

in its finished From the description above given it is thought that nofurther explanation of the process or of the manner of carrying it outis required. Of course in practicing the invention a practical 01'skilled molder will use numerous appliances and perform severaloperations which I have not deemed it necessary to set forth in anygreater detail than I have.

What I claim is- 1. The method herein described of producing matchedpattern plates which consists in preparing a drag and a cope flaskmember containing, in sand, the exact impression of the pattern belowand above the parting line respectively, forming from these members andthe pattern supplemental drag and cope members, and associating theoriginal drag with the supplemental cope, and the original cope with thesupplemental drag spaced to an amount equal to the thickness of theplate desired and obtaining from such molds the finished matched plates.

2. The method herein described of producing matched pattern plates whichconsists in preparing a drag and a cope flask member containing, insand, the exact impression of the pattern below and above the partingline respectively, forming from these members and the patternsupplemental drag and cope members, laying on the sand around theimpressions in the original member pattern frames of the desiredthickness and on the edges of the flask members strips of the samethickness as the said frames, filling the spaces between said strips andthe frame wit-h sand, withdrawing the pattern frames, and associatingthe ori inal drag with the supplemental cope an the original cope withthe supplemental drag, and obtaining from the molds thus produced thefinished matched pattern plates.

In testimony whereof I hereto aflix my

